MG MG6 Series 2011 Service Manual page 760

Lighting Systems
20 second delay (except if the lamps switched on from
the momentary switch).
• The vehicle is locked using the handset.
• After a 15 minute period, if a door or the boot remain
permanently open.
• After a 15 minute period, the glovebox lamp (if fitted)
and/or map reading lamp(s) are left permanently on.
• The handset is docked or ignition on.
• The vehicle battery voltage drops below a specified level.
• The inertia switch is reset.
When the interior lamps are switched on by automatic
control, the PWM output for the lamps is increased on a
linear ramp over a period of 1.3 seconds to slowly increase
the lamp intensity.When the interior lamps are switched off
by automatic control, the PWM output is decreased on a
linear ramp over a period of 2.8 seconds to slowly decrease
the lamp intensity to the off condition.
Interior Lamp Disable
The driver can switch the interior lamp operation off
permanently, preventing all automatic control. The interior
lamps can still be operated manually using the light switch on
the front interior lamp assembly.
Automatic Control Enable/Disable
Pressing and holding the switch for more than 5 seconds will
illuminate the interior lamps and disable the automatic control.
Confirmation is indicated by the interior lamps giving a short
flash off, on and then off again.
If the interior lamps are on (or off), pressing and holding the
momentary switch for more than 5 seconds will switch off the
interior lamps and disable the automatic control. Confirmation
is indicated by the interior lamps giving a short flash on and
then off.
A further 5 second press of the switch will enable the
automatic control of the interior lamps.
indicated by the interior lamps giving a short flash off, on and
then off again.
Inertia Switch Operation
If the inertia switch is tripped and the alarm system is not
armed, the BCM will switch all interior lamps on immediately
and cut the power supply to the fuel pump and unlock the
doors (if locked).
When the inertia switch is tripped, contacts within the switch
open creating an open circuit. When the BCM detects that the
battery feed has been removed, it activates all of the interior
lamps. When the inertia switch is reset, the BCM receives the
battery feed via the switch and turns off all the interior lamps.
Version 2.0
Fascia Illumination and Dimming
All switch, panel and instrument pack illumination is produced
by LEDs. The LEDs are powered by the BCM when the rotary
light switch is in the side lamp or headlamp position. A rotary
thumbwheel dimmer potentiometer is located adjacent to the
Master Light Switch (MLS) and adjusts the brightness of the
following illumination:
• Docking port for handset
• Sunroof switch
• Automatic gearbox selector and gearbox control switch
• Cigar lighter
• Slip Control Switch
• Hazard warning light switch
• Heated rear window switch
• Cruise control switch
• Master lock switch
• Driver's Door Switch Pack
• HVAC switches
• ABS switch
All LEDs are driven by the MLS on a PWM output. The
thumbwheel potentiometer provides the selected dimming
setting signal to a MOSFET in the MLS. The MOSFET drives
the LEDs with a PWM output appropriate to the selected
setting.
Confirmation is
Lighting
744